Vocera Smartphone Installation Guide download pdf (Page 140)

Configuring Cisco Lightweight Access Points

140 ··· Vocera Infrastructure Planning Guide

RRM allows access points to dynamically adjust their transmit power and

wireless channels used by the access points to compensate for coverage holes

and interference in the WLAN. If RRM is not configured correctly, transmit

power asymmetry can result. Although the access point's signal can reach the

badge, the badge's signal may not be able to reach the access point. This may

cause choppy audio or one-way audio on Vocera badge calls.

Note: Before enabling RRM features, it's important to establish a good and

stable environment. Once the WLAN is stable, you can enable RRM to adapt to

changes that occur in the WLAN.

To configure a Cisco Unified Wireless Network for the Vocera VLAN:

1. Design your wireless network taking into account the specifications of the

Vocera badge. For more information, see Power on page 37.

A Vocera VLAN requires a dense deployment of APs to provide proper

coverage and avoid power asymmetry problems. Determine where APs will

be placed when they transmit at a power level of 3 (equivalent to 25 mW)

and not the default power level of 1 (equivalent to 100 mW).

2. Make sure your Cisco WLAN Controller software has been updated to

version 4.1.185 or later. Check with Vocera Technical Support for the

latest recommendations about Cisco WLAN Controller software versions.

3. Temporarily disable dynamic power level assignment in the APs using either

the Cisco WCS or Cisco WLC Web User Interface. Here are the instructions

for the Cisco WLC Web User Interface:

a. Click Wireless to access the All APs page.

b. Access the 802.11b/g Global Parameters > Auto RF page. See the

following figure.

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Vocera Smartphone Installation Guide Page 140